<!doctype html>
<html>

<head>
    <meta charset="utf-8">

</head>

<body>

    <div id="CountMsg" class="HotDate">
        <span id="t_d">00天</span>
        <span id="t_h">00时</span>
        <span id="t_m">00分</span>
        <span id="t_s">00秒</span>
    </div>
    <script type="text/javascript">
        function getRTime() {
            var EndTime = new Date('2018/11/11 00:00:00'); //截止时间 
            var NowTime = new Date();
            var t = EndTime.getTime() - NowTime.getTime();
            var d = Math.floor(t / 1000 / 60 / 60 / 24);
            var h = Math.floor(t / 1000 / 60 / 60 % 24);
            var m = Math.floor(t / 1000 / 60 % 60);
            var s = Math.floor(t / 1000 % 60);
            document.getElementById("t_d").innerHTML = d + "天";
            document.getElementById("t_h").innerHTML = h + "时";
            document.getElementById("t_m").innerHTML = m + "分";
            document.getElementById("t_s").innerHTML = s + "秒";
        }
        setInterval(getRTime, 1000);
    </script>
</body>

</html>